The idea behind split fins is that instead of just propelling the diver forward, the split creates a...">

Are split fins really inefficient?

+2 votes
asked Jul 10, 2018 in Scuba Diving by Davidb (1,816 points)

3 Answers

+3 votes
answered Jul 10, 2018 by VADiver (940 points)

The idea behind split fins is that instead of just propelling the diver forward, the split creates a vortex that assists in propulsion and speed. Another benefit of splits is that the opening allows water to pass through easily on the upward fin stroke. Since the upward fin stroke is the movement that achieves the least amount of propulsion, having the split is more energy efficient than having to kick upward with a standard blade fins. This makes the split fins easier to use in many cases and allows divers to conserve air because they don’t have to kick as hard.

As a result, split fins are good for casual divers using a scissor kick, inexperienced divers who may not have good kicking technique yet, and divers who have ankle or knee problems and cramp easily. However, blade fins are more powerful, and many divers argue that split fins do not provide enough power to fight through tough currents.

So, split fins are more efficient in terms of propulsion and oxygen conservation but blade fins provide more powerful thrusts. The type of fin used should depend on the type of diving.

commented Jul 10, 2018 by Davidb (1,816 points)
Wow, champion explaination, many thanks!
commented Jul 11, 2018 by Cvet (3,369 points)
Nice reply. Years ago I was diving in a Texas spring when a guy swam by me, he was about 10 feet off the bottom and as he kicked.  I could see the water movement all the way to the sand. He was moving a lot of water. I went out and bought a pair of split fins and have dove them for the last 10 years.
+2 votes
answered Jul 18, 2018 by Knewsom (650 points)
Split fins generally cause less stress on one's knees.  I used ScubaPro twin Jets.  I tried a pair of Mares Xtreme and couldn't make 2 laps in a pool before my knees were killing me.
0 votes
answered Jul 13, 2018 by frontbeast (2,220 points)
I like mine, they work fine
commented Jul 13, 2018 by Davidb (1,816 points)
Thanks what kind?
commented Jul 13, 2018 by frontbeast (2,220 points)
Google... Ist talaria split finns
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